How to pass a activity like a finish button?

In my code how to setup my  worklistitem?      I want system to jump this activity (auto approve)    

 For Each wlim In wlai
                     If wlim.ProcessInstance.Name = "test" Then
                        If wlim.ProcessInstance.Folio = "XXXX" Then
                            With wlim.ProcessInstance
                                      wlim.ActivityInstanceDestination.DataFields("P1ActionTest").Value = "Approve"
                            End With
                        End If
                    End If

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